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Mapping regions of high temporal variability in Africa

Colditz, Rene und Conrad, Christopher und Schmidt, Martin und Schramm, Matthias und Schmidt, Michael und Dech, Stefan (2006) Mapping regions of high temporal variability in Africa. In: Proceedings, . ISPRS Mid-Term Symposium Remote sensing: from Pixels to Processes, 2006-05-08 - 2006-05-11, Enschede (The Netherlands).

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Kurzfassung

Long term observation of space-borne remote sensing data provides a means to explore temporal variation on the Earth’s surface. This improved understanding of variability is required by numerous global change studies to explain annual and interannual trends and to separate those from individual events. This knowledge also can be included into budgeting and modeling for global change studies. The study employs daily 8km NOAA AVHRR data of the Pathfinder program to study changes in the annual variability of the African continent between 1982 and 2000. The daily data were processed to improved 10-day composites using an iterative approach including metadata and robust statistical techniques. Seasonality analysis using harmonics and its explained variance is combined with cross correlation between years with identical seasonality to account for temporal shifts. Deserts and the inner-tropical rain forest with none and moderate variability, respectively, are circled by a zone of transition assigned with high variability and changing seasonality. In between there are two gradual units of stability, usually identified as grassland or woodland by continental classifications. This relatively zonal pattern is altered in the eastern tropics and Namibia by varying topography and oceanic influences, respectively. The results can provide a basis for spatial distributed modeling of dynamic hotspots such as the transition zones bordering the savannas and for linking vegetation dynamics with continental climate models.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Mapping regions of high temporal variability in Africa
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Colditz, ReneNICHT SPEZIFIZIERT
Conrad, ChristopherNICHT SPEZIFIZIERT
Schmidt, MartinUniversity of Wuerzburg, Department of Geography, Remote Sensing Unit
Schramm, MatthiasUniversity of Wuerzburg, Department of Geography, Remote Sensing Unit
Schmidt, MichaelNICHT SPEZIFIZIERT
Dech, StefanNICHT SPEZIFIZIERT
Datum:8 Mai 2006
Erschienen in:Proceedings
Referierte Publikation:Ja
In ISI Web of Science:Nein
Seitenbereich:
Status:veröffentlicht
Stichwörter:Global Change, Temporal Variability, Land Characterization, Harmonic Analysis, Africa, AVHRR Pathfinder
Veranstaltungstitel:ISPRS Mid-Term Symposium Remote sensing: from Pixels to Processes
Veranstaltungsort:Enschede (The Netherlands)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2006-05-08 - 2006-05-11
Veranstalter :ISPRS
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Geowissenschaftl. Fernerkundungs- und GIS-Verfahren (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Umwelt und Sicherheit > Umwelt und Geoinformation
Hinterlegt von: Rene Colditz
Hinterlegt am:04 Sep 2006
Letzte Änderung:27 Apr 2009 13:03

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